Django不提供基于ImageField的图像

Question

我在Django的ImageField上有问题。你知道吗

models.py部分如下所示：

class Post(models.Model):
    author = models.ForeignKey(Author, on_delete=models.CASCADE)
    category = models.ManyToManyField(Category)
    trip = models.ForeignKey(Trip, on_delete=models.CASCADE)
    main_image = models.ForeignKey(Image, on_delete=models.CASCADE, related_name='main_image')
    images = models.ManyToManyField(Image, related_name='images')

class Image(models.Model):
    name = models.CharField(max_length=32)
    picture = models.ImageField(upload_to='pictures/', blank=True)
    trip = models.ForeignKey(Trip, on_delete=models.CASCADE)
    taken = models.DateTimeField(blank=True, null=True)
    uploaded = models.DateTimeField(default=timezone.now)

    def __unicode__(self):
        return self.name

settings.py包含媒体URL和媒体根目录：

# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/2.1/howto/static-files/

STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'static')
MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'media')

还包括我在urls.py的其他SO主题中发现的内容：

from django.contrib import admin
from django.urls import path, include
from django.conf.urls import url
from django.contrib.staticfiles.urls import static, staticfiles_urlpatterns
from django.conf import settings
from markdownx import urls as markdownx

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('blog.urls')),
    url(r'^markdownx/', include('markdownx.urls')),
] + staticfiles_urlpatterns() + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)

最后，我把它放在html模板中，如下所示：

{% extends 'blog/base.html' %}

{% block leftcolumn %}
{% for post in posts %}
<div class="leftcolumn">
    <div class="card" style="max-width: 100%">
        <h2><a href="">{{ post.title }}</a></h2>
        <h5>published: {{ post.published_date }}, by: {{ post.author }}</h5>
        <div><img src="{{ post.main_image.url }}"></div>
        <p>{{ post.byline }}</p>
    </div>
</div>
{% endfor %}
{% endblock %}

但图像没有显示。。 如果我转到url host:8000/media/pictures/test_photo.jpg，我可以看到图像，通常我可以在页面上显示图像（例如，在django markdownx字段中），但不能通过imagefieldurl。你知道吗

有什么问题吗？你知道吗

Answer 1

这条线：

<div><img src="{{ post.main_image.url }}"></div>

应该是：

<div><img src="{{ post.main_image.picture.url }}"></div>

原因是您的模型Image没有url方法。该方法属于ImageField，在本例中是picture。你知道吗